Dual stator two-phase permanent magnet machines with phase-group concentrated-coil windings for torque enhancement

Abstract

Recently, the demand for developing high performance permanent magnet (PM) machines with high torque density and high efficiency are becoming more and more attractive due to the environmental and energy considerations [1]. Notwithstanding the three-phase PM machines are most commonly employed in various industrial and domestic applications benefiting from their well-known high performance, two-phase PM machines are increasingly investigated resulting from their relatively low drive system cost and competitive performance in torque density compared with three-phase PM machines [2]. Furthermore, concentrated windings offering short end-winding and low copper loss have gained more and more interests and been often applied in two-phase machines [3]. However, the reported design for two-phase PM machines with conventional concentrated windings is non-effective to further significantly improve the torque performance. © 2015 IEEE.